This leads to anisotrophic behavior of the material, both in subsequent processing and in the final properties of the ceramic product. In extrusion, the clay mixture is forced through a die opening. The cross section of the extruded product is constant, and there are limitations to wall thickness for hollow extrusions...
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Dry pressing is used for relatively simple shapes. this process has high production rates and close control of tolerances. Dies are usually made of carbides or hardened steel. However the dies can be quite expensive as the must have a high wear resistance from the abrasive ceramic tiles. Wet pressing is used to make very complex shapes...